package model;

import com.mysql.jdbc.Connection;
import com.mysql.jdbc.jdbc2.optional.MysqlDataSource;

import javax.sql.DataSource;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

/**
 * \* Created with IntelliJ IDEA.
 * \* model.User: Administrator
 * \* Date: 2022/5/27
 * \* Time: 20:17
 * \* To change this template use File | Settings | File Templates.
 * \* Description:
 * \
 */

//使用这个类喝关系库建立连接
public class DBUtil {
    private static final String URL = "jdbc:mysql://127.0.0.1:3306/java102_blog?characterEncoding=utf8&useSSL=false";
    private static final String USERNAME = "root";
    private static final String PASSWORD = "123456";

    private static volatile DataSource dataSource = null;

    private static  DataSource getDataSource(){
        if(dataSource == null){
            synchronized (DBUtil.class){
                if(dataSource == null){
                    dataSource = new MysqlDataSource();
                    ((MysqlDataSource)dataSource).setUrl(URL);
                    ((MysqlDataSource)dataSource).setUser(USERNAME);
                    ((MysqlDataSource)dataSource).setPassword(PASSWORD);
                }
            }
        }
        return dataSource;
    }

    public static Connection getConnection() throws SQLException{
        return (Connection) getDataSource().getConnection();
    }

    public static void close(Connection connection, PreparedStatement statement, ResultSet resultSet){
        if(resultSet != null){
            try {
                statement.close();
            } catch (SQLException e){
                e.printStackTrace();
            }
        }
        if (connection != null){
            try{
                connection.close();
            } catch (SQLException e){
                e.printStackTrace();
            }

        }
    }

}
